The generation of spin-echo signals in wide resonance lines for which the rf field intensity H₁linewidth is discussed. Particular attention is given to the case in which the spins turn by angles greater than 360^∘{} during the rf pulses. Inhomogeneities in H₁ lead to a considerable simplification of the expressions used to compute the echo wave form. Experimental wave forms obtained for electron spins in (Ca,Nd)WO₄ are compared with calculated results.
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W. B. Mims (1966) studied this question.
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